Electrical welding apparatus.



UNITED STATES PATENT OFFICE.

THOMAS E. MURRAY, GF NEW YORK, ll'. Y.

ELECTRICAL WELDING APPARATUH.

To all whom t may concern:

lc it known that I, THOMAS E. MURRAY, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented a certain new and useful Improvement in Electrical Weld ing Apparatus, of which the following 1s a specification.

The invention is an electrical welding apparatus, wherein the rotation of one of the two bodies to be welded, causes a movement of the other of said Vbodies into pressing contact with said rotating body at the welding joint. The invention is herein sl own eine bodied in an apparatus for butt-welding the end oi a tube to a iangc plate.

The accompanying drawing is a longitudinal section of a tube'and a flange plate one another.

to be Welded thereon, the said tube and plate being shown in positionin the electrodes of a" .welding machine.

A 'is the tube, to the end of which the flange plate Bis to be electrically welded. On said 'plate is a preferably integral sleeve C," in which the tube A- fits. The slee-ve C thus forms a Socket for the end of the tube, inwhich socket'is'a shoulder, here in the form of a circularrib I) on the flange plate B, which rib registers with the butt end of the tube.

The welding electrodes and pressing means are `constructed as follows:

E and F are annular plates insulated from On the outer face of plate F is lan annular cover plate G. On the outer face of plate E is a flat ring H', haring,r its inner periphery under-cut. The plates E, F, G and ring II are connected by insulated bolts I. On plate E is a circular projection J, which enters "a pulley K and abuts against a shoulder L therein. The rim of the pulley is grooved to correspond with the under-cut inner periphery of 'ring H, so that said ring serves to hold the pulley in place on the circular 'projection J. Secured on the rim of the pulley K and seated in a shoulder formed by a flange M thereon isa toothed ring N, which engages with a pinion O onshaft P, which shaft is rotated, and so, through pinion O and toothed ring N, rotates pulley K. The flange plate B is seated 1n a shoulder` on the front face of pulley K, and has openings ,to receive the pins Q on said face.

The 'inner periphery of sleeve C iS- threaded-to engage a thread cut on the exterior of Specification of Letters Patent.

Patented Mar. 13, 1917.

tube A, near th:` end thereof, as shown at lt. Hence when the pulley K is rotated in the proper direcl ion, the sleeve C engaging with the tube A forces the butt end of said tubc into strong pressing contact With the rib l), and hencz at the welding joint between said tube 1nd flange plate B.

In the central openings of pulley K and plates E, F, G is a tubular electrode S, formed in two lingitudinally divided half sections. At on( end oi said electrode is a flange T, received in a circular recess in cover plate (lr anil bearing against plate F. There is a clearrnce in said recess around iange T, and also a clearance around the body portion of said electrode. At the opposite end of said electrode is a iiange U, which enters tube A. is inserted between the sections of electrode A tapered mandrel V S, and when moved inwardly forces said sections outwardly to expand said electrode, and so to cause c ose contact between flange Il and tube A. Une terminal of the source of. Welding current is connected to plate F, and so to electrode S. The other terminal is connected to plate E, so that the pulley l( becomes the opposite electrode.

The tube A bang adjusted with its butt end in contact with rib l), the welding cur rent is established and at the same time the pulley K is set 'n rotation. The joint is thus subjected to great pressure simultaneously with the softening of the metal by the current, and fn this way, a very strong joint is produced.

'1. Electrical wflding apparatus, comprising means for rttatin-g one of two. bodies to be welded, and inea-ns actuated by said' ing means for rotating one of two bodies tol be welded, and means actuated by said rotating body and engaging the other body for moving said la st-named body into pressing contact With :laid rotating body at the weldin joint.

4:. E ectrical We ding apparatus, comprising means for rotating one of two bodies to be welded,'and a sleeve on said body receiving and internally threaded to enga e the other of said bodies; whereby upon te rotation of said first-named body, said lastnnmed body shall be drawn into said sleeve und into pressing contaet with said rotating body at the Welding joint.

5, Electrical tube-welding apparatus, oompris'ng means for rotating the body to which the tube is to b butt-welded, and a sleeve on said body receiving and internally threaded to engage with said tube; whereby said tube is moved longitudinally into pressing butt Contact with said rotatlng body at the Welding joint.-

` In testimony whereof I have aixed my signature in presence of two Witnesses.A

ITHOMAS E. MURRAY.

Witnesses:

GERTRUDE T. PORTER, MAY T. MCGARRY. 

